Pulley block



[Jill 14, 1925.

H. BURRMANN PULLEY BLOCK Filed Ana. 8, 19

R mm m m W Va w m M WY Patented July 14, 1925.

HENRY Bonn-Mann, on DAVENPORT, Iowa; 1

PULLEY BLOCK. i

j application filed was a, 1923; saia1 .t56,3a;

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Be it known that LllnNRv BURRiirANN,

a citizen' of the United States, residing at Number 2303 Brady Street, in the city of Davenport, in fthe county of'Scott, inithe State of Iowa, haveinvented a. newv and useful Pulley Block, of which the following is aspec'ification.

My invention relates to improvements in pulley-blocks, in which the pulley is in stalled within a bifurcationof theblock; and the objects of my invention are; first, to provide a ulley block in which the pulley is capable of being readily installed or removed and in which pulleys of varying sizes may be installed without the use of tools, to suit the necessities of the user; second, to provide a pulley capable of being securely installed in its block without the means of bolts, nuts, or rivets; third, to pro- (ride for a pulley a block suitable for immediate use With various sizes of pulleys; fourth, to provide for a pulley a block oapable ofretaining the pulley in position, yet more readily adapted to the speedy installation or removal of the pulley therefrom.

I attain these objects by the mechanism illustrated in the accompanying drawing, in which Figure 1 is a view of a front elevation of the pulley and movable pulley block, disclosing in dotted lines the axle of the pulley and the inner construction of the block, and also the means of retaining the axle in the block.

Fig. 2 is a view in elevation of the inside of a jaw of the movable pulley block in dotted lines disclosing the Working of the pulley, under varying conditions.

Fig. 3, is a View in cross section of the pulley disclosing its construction, particularly with reference to the disc and axle of the major member and the fitting of the minor member thereto.

Fig. 4, is a View of a side elevation of a minor member of the pulley, taken on its outside.

Fig. 5, is a view of a side elevation of major member of the pulley taken on its inside.

Similar numerals refer to similar parts throughout the several views.-

Block 1 is the groundwork of my inven tion. Block 1 has in its end ajbifurcation 9, said bifurcation 9, being formed suitable for receiving a pulley 12. Said pulley 12 is formed ofainajor disc-.me'ml)er 11 having hubs 11 and 11 and a"huble's='s, minor" disc" member 10.

Minor disc" member 10 has ahole 10 in its center provided with a key Way 110, suitable for httingflupon the taperedportion 11 of hub 11, and to facilitate the snug fitting of minor disc member 10, upon said taperecl portion 11?? of hub 11 the said hole "10 'is also made concave. In order to prevent minor disc'memb'er 10 from revolvingon the "taperedportion 11 of hub '11, I have provided on said tapered portion. a fixed longitudinal key 11, suited for engaging said key way 10 provided in the ta eredhole 10 of said minor disc member'lO.

Upon the outside of major disc member 11, around the hub 11, is provided a raised bearing portion 11 and upon the outside of minor disc member 10, around the hole 10 is provided a similar raised bearing portion 10".

Around the perimeters of major and minor disc members 11 and 10, respectively are provided chamfered surfaces 11 and 10 of a form suited to create a tackle channel when the insides of said major and minor discs are placed in juxtaposition.

Hub ends 11 and 11 are similarly journaled suitable for fitting into channel 4, and to revolve in the grooved hanger boxings 5 and 6 of the block 1; said hub ends 11" and 11 being also provided with transver c grooves 11 and 11 suitable for receiving the channel keys 7 and 8 of said block 1., which channel keys are fitted Within channels 4 of block 1, in close proximity to groove hanger boxings 5 and 6 of block 1, their purpose being to aid in retaining said journaled hub ends 11 and 11 within said grooved-hanger-boxings 5 and 6 when said pulley 12 is in operation.

The block 1, has bifurcation 9, which tere V tion of hub ends 11 and 11 into said grooved hanger boXings 5 and 6, and in said channels are fixed key pins 7 and 8, which are of dimensions suited to thread grooves 11 and 11 provided in thehub ends 11" and 11 hanger boxings-5 and 6 which are composed block said block being bifurcated, the Walls, of said, bifurcation being provided with downwardly 1 directioned 2 grooved channelshaving perpendicular Walls, said grooved of right angular Walls 5 5"; 6 6 Blo l n -P 1 4 1 of vsuitable}inaterial 1 I claiin: Q r A pulleybloek, comprised of a pulley and :1. channels; leading into grooved hangerboxings perpendicularly disposed in the of said bifurcation in such manner as to suitae blv: loosely engage the hub ends of said pul-.

may be constructed ley when installed therein} key pin means installed within the said grooved channels,

positioned near the junction of said grooved channelsiwitli said grooved hanger boxings; sa1d pulley having ournal hub portions provided with transverse aligned key Ways in their extremities, adapted to cooperate with 'said key pindneans; in such Way as to admit the said hub ends into thev said grooved hanger boxings and facilitate" the retaining of said; huh ends ithin s'aidi boiiings when saidpulley block isnotin use" Done at the city j'of -Davenport, in"the I county of Scott, i I hes tate fslide y wen li- 4923. a HENRY. BURRMANN:

, JPELIZABETHBURRMANN,1 a; I B nnrnA. GHnz a iofeloyva this 

